The waif of a girl stood amid the dust and the diesel fumes on a shoulder of the highway selling herself for $12 a time, to also meet her acquired drug addiction.

The highway passes through dirt poor Brazilian towns like Salgueiro, where girls as young as nine are sent out to sell themselves.

Often, when truckies had finished with her, they would just push her out the door of the long drop down from the cabs of their car-carriers or semi-trailers.

In a new short documentary just released by the Pink House, Alejandra speaks of her life on the road, getting picked up, used and paid by convoy of passing drivers.

A truck drives through remote Candido Sales, where girls like Alejandra work throughout the night. Picture: Meninadanca.

"We get inside and they ask where will you get off?" Alejandra says, standing in the dark with another young sex worker as trucks and cars roll by. "So we say where we will get off and he pays where we get off.

"He pays there and we take it and when we come back we take another truck.

Two young Brazilian girls who worked as child prostitutes.

"If we don't get a lift, we come back walking.

"They are bad to us, these truck drivers are perverts.

Mara, a former street girl from the town of Serrinha.

"If we don't sleep with them, they will kill us, or they might rape us.

"Or they might chop us up, they might do anything."

The Pink House teaches girls self worth and to respect their bodies. Picture: Meninadanca.

Pink House co-ordinator Claudia takes the video camera along a street in Candido Sales which the young girls frequent.

"There's a woman in town who picks up these girls who hang around and takes them to her house and there it's turned into a brothel," Claudia said.

"This is child prostitution, but here it's like the town is blind to this, you know."

Alejandra, 14, works as a street prostitute sleeping with truckies who she fears may kill her. Picture: Meninadanca.

Alejandra takes the documentary makers to the small, dingy house, where she ostensibly lives with her grandparents, and shares a tiny room with her disabled brother.

Her grandfather becomes teary when asked why Alejandra constantly runs away, and says plenty of food and rice is provided to the girl.

Emilly, who was taken from her family and raped and murdered in 2014. Picture: Meninadanca.

Alejandra confesses she loses her temper with her grandparents, perhaps because she is not the centre of attention.

"At home I talk with my mum, my grandmum who I call my mum and she turns her back and doesn't give me attention," Alejandra said. "I get so angry at home.

Alejandra said she was "afraid" and the interviewee convinced her to return to the Pink House in Candido Sales, where girls are taught self worth and encouraged to dance and respect their bodies.

Alejandra dances with the girls and expresses a wish to become a ballet dancer, or dance teacher.

Brazil's infamous federal highway brings misery to the small poverty-stricken towns along its route.

Co-ordinator Claudia believes the Pink House can work to end the child prostitution which is ruining the lives of Brazil's poorest young girls.

In the lead-up to the 2014 World Cup soccer and the 2016 Rio Olympics, media brought world attention on poverty and child prostitution among Brazilians. In particular, an image by the BBC's Panorama of two very young girls in the shadow of the Castelao World Cup Stadium in beachside Fortaleza shamed the country.

The Pink House in the tiny town of Candido Sales, which is a centre for child prostitution in Brazil.

Reports said girls from the poorer states were being brought in to service workers on building the stadiums for these big events, and then for the sports fans attending them.

Alejandra takes film makers to her home in the town of Candido Sales, where young girls are raffled off by men.

When a 13-year-old girl broke her leg in the Pink House, her mother threatened to sue for loss of earnings because the girl could not work the streets while her leg was in plaster.

The Pink House had to change its schedule to fit the lives of the girls, many of whom spent the entire night on the streets.

But in March this year, the young girls took part in a march against child sexual exploitation, stopping truck drivers and traffic on the motorway.

Alejandra dances at the Pink House.

Claudia and her team are "beginning to see lives transformed as the girls start to understand their true worth … and that they deserve a happy and fulfilled future, free from exploitation and abuse".

She added: "I believe we can change this. I believe in the future this will end.

"I have faith in the little (Meninadanca has to) offer, and it's not much, just getting close to a girl like that, talk and listen."

But is it too late for Alejandra? "She's not one of the regular girls. She comes sporadically to the house.

"Often something has to happen for us to bring her to the house. She's a little difficult.